PDF malware analysis — malicious · 74386616e09d1d3a

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 22:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: fde8ef2dad2352065ac22161463289cb SHA-1: 422b01d23bec125e82159e097cd0e240d40b89dd SHA-256: 74386616e09d1d3a16e4a35dd6d5c32c88f2d8a331bce9753a3b5dbd1d5d07a2

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, suggesting it's designed to trick users into contacting malicious actors under the guise of support or billing issues. While no scripts were explicitly extracted, the PDF structure and associated URLs point towards a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://wastran.ru/uplcv?utm_term=mimo+learn+to+code+apk PDF link annotation
- http://konikanarrowfab.com/ckfinder/userfiles/files/80001098670.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139d4c47de0b---9800077807.pdfIn PDF document text
- https://hobbypet.cz/files/file/41297907954.pdfIn PDF document text
- http://tion.hu/upload/file/pomowujuvomi.pdfIn PDF document text
- https://cleartunemonitors.com/ckfinder/userfiles/files/75962660742.pdfIn PDF document text
- http://kipia-nn.ru/userfiles/file/porukejegerurujibudatu.pdfIn PDF document text
- https://www.lire-les-notes.com/ckfinder/userfiles/files/92532869346.pdfIn PDF document text
- https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/89003705112.pdfIn PDF document text
- http://prtourusa.com/FileData/ckfinder/files/20210905_3C1F07290F472F77.pdfIn PDF document text
- http://skiflogistics.ru/userfiles/file/wojorimaza.pdfIn PDF document text
- http://www.eurosecurimed.com/ckfinder/userfiles/files/89157326443.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/51881570533.pdfIn PDF document text
- https://giant-nano.com/app/webroot/userfiles/files/10013435907.pdfIn PDF document text
- http://studiotecnicoprato.eu/userfiles/files/maluxuziguzokopa.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bbhg8e7rb4mglum58g8d2jva62/54206388525.pdfIn PDF document text
- http://ffarchitettura.it/userfiles/files/57470710080.pdfIn PDF document text
- https://bruceleevideos.org/images/file/pijepevefifuxu.pdfIn PDF document text
- https://anyimaker.com/upload/users/files/34799768575.pdfIn PDF document text
- http://startmatbaa.com/userfiles/file/19760031313.pdfIn PDF document text
- http://dongphat.net/upload/files/22371202891.pdfIn PDF document text
- http://africareview.in/userfiles/file/33713966706.pdfIn PDF document text
- http://biancoacolori.it/userfiles/files/sexodebovuvilaxu.pdfIn PDF document text
- https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eff9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF9	17812 bytes
SHA-256: `89fd755f801029d5452d5ce4ca82888ffd0cf16e8b640c96653f3966d5b062f0`
`font_02_sfnt_off00011d81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D81	10592 bytes
SHA-256: `bfc7ccf745df8cbab341c0707df66667de563059285a1acea8a9886764757328`

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